Add seperate menu only showing the changed settings between template and current game config

[frostworx]

Rough idea:
IMHO it would be very useful to have a menu available, where one can see at once,
which settings of the current game config differ from the current template config.

Ideally showing the original menu entry (including original configuration option)
and maybe use the value from the current template as a tooltip.
Not sure yet where to the best place it.
Suggestions welcome.

[frostworx]

It will be available from the CATEGORY drop down menu.

[frostworx]

copy/paste of the (wip & offline) stl wiki:

Game Config differences

Behind the menu option GameConfigDiffers in the Category-Menus lies a menu,
which only shows those settings in the Game Config,
which differ from the values in the Default Config.
The corresponding tooltip also shows the current value from the Default Config.
All settings can be edited and saved like in every other menu.
When selecting SAVE the GameConfigDiffers menu is re-created automatically.

[frostworx]

Added in release v6.13